Diagnosing a toilet leak? There's a rubber gasket that sits between a toilet tank and the bowl called a spud gasket. It works with the flapper valve to control the flow of water between holding tank ...

It Fails The Dye Test: To check your toilet for leaks, put a few drops of food coloring into the water tank. Wait 30-45 minutes. If the water in the toilet bowl has changed color, it means that water ...